Mainecoons Posted November 25, 2019 Report Share Posted November 25, 2019 We have one of those nice jetted tubs in our master bath we do not use because it needs too much hot water. We could put a solar hot water heater on the roof above it and it would be fairly easy to pipe to it. How would one figure how big/number of tubes needed for this? Would also be used to supply other hot water for this bath room when tub not in use. Quote Link to comment Share on other sites More sharing options...
NLU Posted November 25, 2019 Report Share Posted November 25, 2019 I suspect that a 60 liter solar boiler would suffice if all you are interested in is the tub. But, the prices, including installation, are quite low even for a 240 liter. I have 2 240s, 2 120s and a 60, free hot water for the tubs (I have 4) and everything else! ALL bouight from alfonso@solartechnology.com.mx I know he's in Guad, but 12 years ago, I had a bad install from someone who subcontracted from him. The damned thing blew up, but Alfonso replaced it at his expense. i have done myriads of business with him ever since and recommend him HIGHLY! 1 Quote Link to comment Share on other sites More sharing options...
Go Solar Posted November 25, 2019 Report Share Posted November 25, 2019 MC, take into account the size of the jetted tub, plus the other regular intended use. Or, and better IMHO, plan to provide for the whole house, vs just the bathroom. Email or PM - YOU know how to reach me! 😉 Quote Link to comment Share on other sites More sharing options...
Mainecoons Posted November 26, 2019 Author Report Share Posted November 26, 2019 19 hours ago, Go Solar said: MC, take into account the size of the jetted tub, plus the other regular intended use. Or, and better IMHO, plan to provide for the whole house, vs just the bathroom. Email or PM - YOU know how to reach me! 😉 The issue with that is the only feasible location is a rooftop area that we regularly use for entertaining and I don't want to fill it up with one of those massive tube units. Quote Link to comment Share on other sites More sharing options...
Go Solar Posted November 26, 2019 Report Share Posted November 26, 2019 MC, as usual, ask and you shall receive....STI now has a tankless compact solar water heating panel that both heats, AND stores, the water; 150 liters per panel. While we still reco the tube and tank systems as the default due to the high efficiencies of the vacuum tube and insulated tank technology, this is a great option / alternative for what you mention, and also for all the tiered housing communities who like to keep the rooftops as clear and uncluttered as possible. (exceptions include the critically important satellite TV dishes.....) 😉 Coupled with an auto on-demand backup, this can be a great solution. Image here, Spanish and English versions up on the website in the near future. Quote Link to comment Share on other sites More sharing options...
Mainecoons Posted November 26, 2019 Author Report Share Posted November 26, 2019 I can't tell a thing from this, can you email me more details? Quote Link to comment Share on other sites More sharing options...
Go Solar Posted November 26, 2019 Report Share Posted November 26, 2019 Done. Full PDF spec sheet is avail; just email or PM me. Quote Link to comment Share on other sites More sharing options...
Mainecoons Posted November 26, 2019 Author Report Share Posted November 26, 2019 This looks similar to that Chinese tankless system you showed me several years ago. An updated version? Quote Link to comment Share on other sites More sharing options...
Go Solar Posted November 27, 2019 Report Share Posted November 27, 2019 Totally different technology; that one stored the heat in a special mass; and was more like a "solar on demand" unit, while this one actually stores the heated water. 1 Quote Link to comment Share on other sites More sharing options...
Mainecoons Posted November 27, 2019 Author Report Share Posted November 27, 2019 7 hours ago, Go Solar said: Totally different technology; that one stored the heat in a special mass; and was more like a "solar on demand" unit, while this one actually stores the heated water. What happened with those earlier tankless? Problems? Quote Link to comment Share on other sites More sharing options...
Go Solar Posted November 28, 2019 Report Share Posted November 28, 2019 Yes, great concept with sizing down utility scale thermal mass storage, however there were some manufacturing issues. All were taken care of n/c. Quote Link to comment Share on other sites More sharing options...
Mainecoons Posted November 28, 2019 Author Report Share Posted November 28, 2019 Aren't they more compact than these? Do you sell both now? Quote Link to comment Share on other sites More sharing options...
Go Solar Posted November 28, 2019 Report Share Posted November 28, 2019 Just the water based one for now; for smallest size, the KED heat pipe dry vacuum tube systems of 100 liters and up are quite compact and a great proven technology; the tank is rated for high pressure and insulated to have good hot water even after sitting overnight. Quote Link to comment Share on other sites More sharing options...
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